feat: 上传组件默认大小上限提升至50MB并同步帮助文案

liu

2026-09-04 cd4443ce395cb51c06e198a962614329a830efea

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export { default as ConversationPickerPanel } from './conversation-picker-panel.vue';
export { default as FriendPickerPanel } from './friend-picker-panel.vue';
export { default as GroupMemberPickerPanel } from './group-member-picker-panel.vue';